JPH1019352A - Duct joint for air flow passage duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely and simply demount a duct without reqiring a tool such as a driver in a duct joint for the duct for an air passage. SOLUTION: A duct joint 1 comprises a duct joint body 3 including an insertion tip end 2, a flare inner pipe 5 slidably inserted into the insertion tip end 2 in the state where it is inserted into the tip end 4a of the duct, and a flare nut 7 fitted to the duct joint body 3 externally and including fixing means 6. A reverse tapered flare reception part 9 is formed at a base of the insertion tip end 2, and a flare part 10 overlapped on the flare reception part 9 is formed on an opposite end part of the flare inner pipe 5 and further a second flare part 11 is formed on the other end of the flare inner pipe 5. A duct press part 12 is formed on the flare nut 7, which press part is fitted externally to the flare inner pipe 5 between the flare part 10 and the second flare part 11 for pinching the duct tip end part 4a between it and the flare inner pipe 5. The flare part 10 of the flare inner pipe 5 is brought into close contact with the flare reception part 9 of the duct joint body 3 through the duct press part 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a duct joint for a duct for an air flow passage of an air conditioner or the like.

[0002]

2. Description of the Related Art In an air conditioner such as a heat pump, a duct for air flow is connected to a duct joint formed in this device to form an air flow passage for introducing temperature-controlled air from inside the device to a room. Forming is being done.

FIG. 14 is a cross-sectional view showing a connection structure between such a conventional duct joint and a duct, and FIG. 15 is a perspective view of the same, and a duct 4 is a flexible long cylinder wound with a heat insulating material or the like. The tip 4a is formed in a parallel cylindrical shape.

[0004] The duct joint 18 is formed of a parallel tube attached to the outlet chamber C. The distal end 4a of the duct 4 is fitted into the tube, and a screw-tight type is inserted from above. The duct 4 is fixed by tightening with a steel plate band 19.

[0005]

However, in the above-mentioned conventional duct joint, since the band is of a screw fastening type, it takes time to fix the duct and the duct joint is a parallel tubular shape. There is a problem that a large tightening force is required for the band, and if the band is loose, the duct is likely to come off.

FIG. 16 is a cross-sectional view showing a nipple in which ducts are connected to each other. However, the nipple 20 has a similar problem because it has a structure using a tubular body and a band 19 in the same manner as described above. doing.

SUMMARY OF THE INVENTION An object of the present invention is to deal with the above-mentioned situation and find a new structure for a duct joint so that a duct can be easily and reliably attached and detached without using a tightening tool. .

[0008]

That is, a duct joint for an air flow duct according to the present invention, which meets the above object, has a duct joint body having a cylindrical insertion tip and a duct joint inserted at the tip of the duct. A sleeve-shaped flare inner tube slidably fitted to the insertion tip in a state, and a flare nut having a fixing means fitted to the outside of the duct joint body and detachably engaged with the duct joint body. And a flare receiving portion that expands in a reverse tapered shape at the base of the insertion end portion of the duct joint body, and an inverted tapered flange shape that overlaps with the flare receiving portion is formed at the opposite end of the flare inner tube. A flare portion is formed, and a second flare portion having a required diameter is formed at the other end of the flare inner tube, and the flare nut is connected to the flare inner tube between the flare portion and the second flare portion. Fit this A duct holding portion for holding the distal end of the duct between the inner tube and the inner tube, and by means of fixing the flare nut, the flare portion of the flare inner tube is connected to the duct joint body through the duct holding portion. It is characterized by being pressed against the flare receiving portion.

The flare nut fixing means is formed on the outer peripheral surface of the duct joint body at a plurality of stopper ribs formed at substantially equal intervals, and is formed on the inner peripheral surface of the flare nut corresponding to the arrangement of the stopper ribs. A plurality of stopper claws may be formed, and the stopper ribs and the stopper claws may be formed to have substantially the same direction and substantially the same angle of inclination so as to be screw-coupled.

Further, a plurality of split grooves are formed in the second flare portion of the flare inner tube in the axial direction and elasticity is imparted, so that the diameter of the second flare portion can be reduced. It is also possible to facilitate insertion into the duct.

It is also possible to form a nipple by forming the configuration of each of the above-mentioned duct joints on one half and the other half of the cylindrical body.

[0012]

According to the duct joint of the present invention, the tip of the duct is first inserted into the duct holding portion of the flare nut,
Insert the flare inner tube inside the inserted duct tip, and hold the tip of the duct between the flare inner tube flare and the flare nut duct holding portion while holding the duct tip with the peripheral surface of the flare inner tube. With the second flare portion, the front and rear sides of the holding portion are pushed outward and fixed to the flare nut in a sealed state.

Then, the flare inner tube integrated with the flare nut is inserted into the insertion end of the duct joint body,
The flare nut is fixed to the duct joint body by the fixing means.

Accordingly, the flare portion of the inner tube of the flare is pressed against the flare receiving portion of the duct joint body, and the tip of the duct is sandwiched between the duct holding portion of the flare nut and the flare portion. A tight seal of the duct joint is provided.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the present invention will be described.

FIG. 1 is a sectional view showing a duct joint according to a first embodiment of the present invention, FIG. 2 is an exploded perspective view of the same, FIG.
It is a perspective view.

The duct joint 1 of the above embodiment is formed so as to protrude substantially horizontally from the outlet chamber C, and has a duct joint body 3 having a parallel cylindrical insertion tip 2 and air as shown in FIG. A sleeve-shaped flare inner tube 5 that is slidably inserted into the insertion distal end portion 2 in a state of being inserted into the distal end portion 4a of the flow channel duct 4, and is externally fitted to the duct joint main body 3 and this duct joint And a flare nut 7 having fixing means 6 detachably fixed to the main body 3.

The base of the duct joint body 3 from the insertion tip 2 is formed coaxially with the insertion tip 2 as a large diameter portion 8 that can be fitted with the flare nut 7. A portion between the insertion tip portion 2 and the insertion tip portion 2 is formed as a tapered conical slope over the entire circumference to form a flare receiving portion 9.

At the opposite end of the flare receiving portion 9 of the flare inner tube 5, an inversely tapered flange-shaped flare portion 10 which can be densely overlapped with the flare receiving portion 9 is formed over the entire circumference. ing. At the other end of the flare inner tube 5, a second flare portion 11 is formed in which the diameter of the flare inner tube 5 is expanded substantially in the same shape as the flare portion 10.

On the other hand, the flare nut 7 is externally fitted to the flare inner tube 5 between the flare portion 10 and the second flare portion 11, and the distal end of the duct 4 is provided between the flare nut 7 and the flare inner tube 5. A duct holding portion 12 for holding the portion 4a with pressure is formed in a circumferential shape. Since the duct 4 is made of a flexible material including a heat insulating material or the like, the duct 4 is pressed by the duct pressing portion 12 between the flare portion 10 and the second flare portion 11,
As shown in FIG. 1, the front and rear portions of the duct holding portion 12 swell in a flared manner, and the fixing and sealing of the tip portion 4a of the duct at this portion are performed.

Also, the fixing means 6 for the flare nut 7
4 to 6, four stopper ribs 13 formed on the outer peripheral surface of the large diameter portion 8 of the duct joint main body 3 at substantially equal intervals, and the stopper ribs 13 on the inner peripheral surface of the flare nut 7. Stopper pawls 1 of the same number formed according to the arrangement of
The stopper ribs 13 and the stopper claws 14 are formed with substantially the same direction and substantially the same angle of inclination so as to be screw-coupled to each other. That is, as shown in FIG. 5, the flare nut 7 is inserted into the duct
When the flared nut 7 is rotated by 5 °, the stopper claw 14 is screwed so as to ride on the other side of the stopper rib 13 as shown in FIG. The flare nut 7 is fitted coaxially with the duct joint body 3.

The fixing means 6 for the flare nut 7
As a result, the flare inner tube 5 is moved forward through the duct holding portion 12 (and the duct 4a holding the pinching pressure), and the flare portion 10 of the flare inner tube 5 is transferred to the flare receiving portion 9 of the duct joint body 3. The dimensions of each part are determined so as to be pressed and sealed.

FIGS. 7A and 7B show another example of a flare inner tube. The flare inner tube 5 'has a large number of split grooves 15 in the second flare portion 11 in the axial direction. By forming and providing elasticity, the diameter can be reduced, and furthermore, the insertion guide portion 16 is formed in the second flare portion 11, thereby facilitating insertion of the flare inner tube 5 'into the duct 4. . FIG. 8 is a sectional view showing a duct joint using the flare inner tube 5 ′. By attaching the insertion guide section 16 to the second flare section 11, the contact area of the second flare section 11 with the duct 4 is shown. And the resistance to the removal of the duct 4 is improved.

Next, FIG. 9 is a sectional view showing an example in which the configuration of the first embodiment of the present invention is adopted as a nipple, and FIG.
FIG. 11 is an exploded perspective view, and FIG.

In this example, a pair of nipples connecting the two ducts 4 has the same configuration as that of the first embodiment.
One half and the other half of the cylindrical body 17 are formed respectively.

As shown in FIG. 12, a flare inner tube 5 'having an insertion guide 16 as shown in FIG. 7 can be used for the nipple.

In each of these nipples, 2 is an insertion tip, 3 is a duct joint body, 4 is a duct, 5 is a flare inner tube, 6 is a fixing means, 7 is a flare nut, 8 is a large diameter portion, 9
Denotes a flare receiving portion, 10 denotes a flare portion, 11 denotes a second flare portion, 12 denotes a duct holding portion, 13 denotes a stopper rib, 14 denotes a stopper claw, 15 denotes a split groove, and 16 denotes an insertion guide portion.

In the duct joint according to each of the embodiments of the present invention, as shown in FIGS. 1, 8, 9 and 12, first, the tip of the duct 4 is attached to the duct holding portion 12 of the flare nut 7. The flare inner tube 5 is inserted into the inserted duct tip portion 4 so that the duct tip portion 4a is sandwiched between the peripheral surface of the flare inner tube 5 and the duct holding portion 12 of the flare nut 7. While maintaining the pressure, the flare inner tube 5
The front and rear of the portion where the pressure is held by the flare portion 10 and the second flare portion 11 are spread outward as shown in the figure to be fixed to the flare nut 7 in a sealed state.

Then, the flare inner tube 5 integrated with the flare nut 7 is inserted into the insertion tip 2 of the duct joint body 3, and the flare nut 7 is fixed to the duct joint body 3 by the fixing means 6. As a result, the flare portion 10 of the flare inner tube 5 is pressed against the flare receiving portion 9 of the duct joint body 3, and the duct tip 4 a is clamped between the duct holding portion 12 of the flare nut 7 and the flare portion 10. This results in a tight seal of the duct joint.

In this case, the fixing of the flare nut 7 is performed as follows.
It only needs to be inserted into the duct joint body 3 and turned, and the attachment and detachment of the duct can be performed very easily without the need for tools.
The duct is pushed outward by a flare portion 10 and a second flare portion 11 before and after a duct holding portion 12 of the flare nut 7, and the duct holding portion 12 and the flare portion 1 are further expanded.
0, it is securely fixed without falling out of the duct joint.

The embodiment of the present invention has been described above.
The duct joint body 3 does not necessarily have to be a one-piece. For example, as shown in FIG. 13, the insertion tip 2 is extended as it is to the mounting side, and a separate large-diameter portion made of resin or the like is attached to the extension 2 '. 8 'can be fitted by fitting the projection 21 and the hole 22 or by bonding. In this case, the large-diameter portion 8 'fitted to the base of the insertion distal end portion 2 is attached.
It is preferable that the flare receiving portion 9 is formed by the front end portion. By configuring the duct joint main body 3 in this manner, the duct joint main body 3 can be easily manufactured, and the large-diameter portion 8 'can be attached to an existing sleeve. Can be formed.

[0032]

As described above, the duct joint of the duct for an air flow passage according to the present invention comprises a duct joint body having a cylindrical insertion end and the insertion joint having the insertion end inserted into the end of the duct. A sleeve-shaped flared inner tube slidably inserted into the portion, and a flare nut provided with fixing means detachably fitted to the duct joint body and detachably engaged with the duct joint body, A flare receiving portion that expands in a reverse taper shape is formed at the base of the insertion end of the duct joint body, and a reverse taper flange-like flare portion that overlaps the flare receiving portion is formed at the opposite end of the flare inner tube. Further, a second flare portion having a required diameter is formed at the other end of the flare inner tube, and the flare nut is externally fitted to the flare inner tube between the flare portion and the second flare portion. The above-mentioned Bets tip to form a duct pressing portion for holding clamping, the fixing means of the flare nut,
The flare portion of the flare inner tube is pressed against the flare receiving portion of the duct joint main body via the duct holding portion, and since the flare nut can be fixed using a screw connection or the like, the duct can be removed and attached. This can be done very easily without the need for tools such as a screwdriver, and the above-mentioned duct can be connected to the flare section before and after the duct holding section of the flare nut.
The flared portion pushes outward and expands, and is further sandwiched between the duct holding portion and the flared portion. This has a remarkable effect of securely fixing the duct in a sealed state without falling out of the duct joint. .

[Brief description of the drawings]

FIG. 1 is a sectional view showing a duct joint according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the same.

FIG. 3 is a perspective view of the same.

FIG. 4 is a front view showing a means for fixing the flare nut and the duct joint body.

FIG. 5 is an explanatory view showing a state where a flare nut is inserted into a duct joint main body.

FIG. 6 is an explanatory view showing a state where the flare nut is rotated from the state shown in FIG. 5;

FIG. 7A is a perspective view showing another example of the inner tube of the flare as viewed from the flare section side. (B) It is a perspective view showing the state seen from the 2nd flare part side in the same.

FIG. 8 is a sectional view showing a duct joint using the flare inner tube of FIG. 7;

FIG. 9 is a cross-sectional view showing an example in which the configuration of the first embodiment of the present invention is adopted as a nipple.

FIG. 10 is an exploded perspective view of the same.

FIG. 11 is a perspective view of the same.

FIG. 12 is a cross-sectional view showing an example in which a flared inner tube having an insertion guide section 16 in a nipple is used.

FIG. 13 is a sectional view of a duct joint showing another example of the duct joint body of the embodiment of the present invention.

FIG. 14 is a sectional view showing a conventional duct joint.

FIG. 15 is a perspective view of the same.

FIG. 16 is a cross-sectional view showing a conventional nipple.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Duct joint 2 Insertion tip part 3 Duct joint main body 4 Duct 4a Duct tip part 5, 5 'Flare inner tube 6 Fixing means 7 Flare nut 8 Large diameter part 9 Flare receiving part 10 Flare part 11 Second flare part 12 Duct holding part 13 Stopper Rib 14 Stopper Claw 15 Split Groove 16 Insertion Guide 17 Cylindrical Body 21 Projection 22 Hole

Claims (4)

[Claims] 1. A duct joint body having a cylindrical insertion tip, a sleeve-shaped flare inner tube slidably fitted into the insertion tip while being inserted into the tip of the duct,
A flare nut externally fitted to the duct joint body and having fixing means detachably engaged with the duct joint body, and a flare that expands in a reverse tapered shape at the base of the insertion end of the duct joint body. In addition to forming a receiving portion, a reverse-tapered flange-shaped flare portion is formed at the opposite end of the flare inner tube to overlap with the flare receiving portion. A flare portion is formed, and the flare nut is externally fitted to the flare inner tube between the flare portion and the second flare portion, and the tip of the duct is held between the flare nut and the flare inner tube. An air flow path, wherein a duct holding portion is formed, and the flare nut fixing means presses the flare portion of the inner tube of the flare to the flare receiving portion of the duct joint body through the duct holding portion. For duck Duct fittings. 2. The flare nut fixing means is formed on the outer peripheral surface of the duct joint body at a plurality of stopper ribs formed at substantially equal intervals, and is formed on the inner peripheral surface of the flare nut corresponding to the arrangement of the stopper ribs. 2. A duct joint for an air flow path duct according to claim 1, comprising a plurality of stopper claws, wherein said stopper ribs and said stopper claws are formed to have substantially the same direction and substantially the same angle of inclination so as to be screw-connected. . 3. The duct joint for an air flow duct according to claim 1, wherein a plurality of split grooves are formed in the second flare portion of the inner tube of the flare in the axial direction and elasticity is imparted. 4. A duct joint for a duct for an air flow passage, wherein the duct joint according to claim 1, 2, or 3 is formed in one half and the other half of a cylindrical body, respectively, to form a nipple.